Propeller.



W. E. S. COYNE. PROPELLER. APPLICATION FILED JULY 5. 1912. RENEWEDSEPT-3'. 191s.

INVENTOR Patented Feb. 18, 1919.

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I. PATENT WILLIAM E. S. CO YNE, 0F SPOKANE, WASHINGTON, ASSIGNOR OFONE-TENTH T0 J. W.

CODD, OF SPOKANE, WASHINGTON, AND ONE-TENTH TO COYNE HELICOPTER AIR-SI-IIP COMPANY, OF SPOKANE, WASHINGTON.

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Patented Feb. is, rare.

Application filed July 5, 1912, Serial No. 707,806. Renewed September 3,1918. Serial No. 252,504.

To all whom it may concern:

Be it known that I, WILLIAM E. S. CoYNE, a citizen of the United States,residing at Spokane, in the county of Spokane and State of Washington,have invented certain new and useful Improvements in Propellers, ofwhich the following is a specification.

The ropeller which is the subject of the present invention is designedto prevent the radial flow of water, due to centrifugal force, past thetips of the blades or flukes of the propeller, and also to utilize thisradial flow in the propulsory efiect, whereby a propeller of maximumefliciency is produced.

With these objects in view, the invention consists in a novelconstruction and arrangement of art to be hereinafter described andclaimed, reference being had to the accompanying drawing forming a partof this specification, in which drawing Figure 1 is a lan view of thepropeller;

Fig. 2 is an elevation thereof, and

Fig. 3 is an end view.

Referring specifically to the drawing, 5 denotes the hub of thepropeller. From the hub radiate the blades or flukes 6, which latter maybe flat and straight, or have a helical twist. Two sets of blades areshown,

said sets being spaced longitudinally on the hub. The drawing shows twoblades in each set. For propellers of larger diameter each set will havethree or more blades, and the number of sets may also be varied.

The blades of the respective sets lie in parallel planes, andcorresponding blades of the sets are connected at their tips by atransverse wall 7, which latter closes up the space between the bladesat the tips thereof, and serves to prevent the radial flow past saidtips, thereby reducing the slip of the propeller, the radial flow beingproduced by centrifugal force when the propeller is in The wall also proects rearward from the blades of the rearmost set, so as to prevent theaforementioned radial flow past the tips of said blades.

In order to utilize the radial flow of the water to aid in thepropulsory effect, the tip of each blade extends in a curve from thebody of the blade, as indicated at 8, said curve being entirely acrossthe blade, and extending to the wall 7. The curve is such that theconcave side thereof is astern. Thus, when the centrifugal force beginsto force the water radially along the blades, the water is forced notonly against the walls 7 but also against the inclines formed by thecurves 8, said inclines being rearward or astern. This thrust againstthe inclines augments the propulsory effect to a considerable degree,and adds greatly to the efficiency of the propeller.

It is to be understood that the invention is not limited to marinepropellers, but that it may be applied with good results to aerialvessels.

I claim:

1. A propeller having its blades arranged in ,sets which arelongitudinally spaced apart, and transverse Walls closing up the spacebetween the corresponding blades of the respective sets at the tip ofthe blades, said walls rojecting rearward from the blades of therearmost set.

2. A propeller having its blades arranged in sets which arelongitudinally spaced apart, and transverse walls closing up the spacebetween the corresponding blades of the respective sets at the tip ofthe blades, said walls projecting rearward from the blades of therearmost set, and said blades being provided with an incline at theirtips to receive the thrust of the radial flow of the medium in which thepropeller operates, said incline being rearward.

In testimony whereof I aflix my signature in presence of two witnesses.

WILLIAM E. S. COYNE.

Witnesses:

B. O. HAIgr, Tnos. W. COSTELLO.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

